lenovo y530 dead ite replaced - problems

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

+ i succesfuly updated i think the EC - ite - editing platform.ini from bios update files.

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

- if i connect battery first, and then charger, i cant start laptop.

BQ24780S, dont enable the mosfet from dc in.

- if i conect first charger thne battery, i can start laptop

[mon2]

Re: lenovo y530 dead ite replaced - problems

Likely that you have a leaky mosfet.

The sticky above by @Piernov is a must read.

Often the 2nd dcin mosfet becomes defective.

Remove all power. Meter in resistance mode.

Check the resistance of each of the DCin mosfets.

Check:

Source & drain
Source & gate
Gate & drain

Post each resistance measurement.

After the above checks..

Connect the adapter and battery in the mode that fails to power on. Meter in dc volts mode (20v or higher).

Carefully check the voltage to ground of each pin on the charger IC.

Post each measurement and the pin being tested.

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

Likely that you have a leaky mosfet.

The sticky above by @Piernov is a must read.

Often the 2nd dcin mosfet becomes defective.

Remove all power. Meter in resistance mode.

Check the resistance of each of the DCin mosfets.

Check:

Source & drain
Source & gate
Gate & drain

Post each resistance measurement.

After the above checks..

Connect the adapter and battery in the mode that fails to power on. Meter in dc volts mode (20v or higher).

Carefully check the voltage to ground of each pin on the charger IC.

Post each measurement and the pin being tested.

///////

pq201 first mosfet
Source & drain 3.7mohm
Source & gate 3.69mohm
Gate & drain 0 mohm

pq202 second mosfet
Source & drain 4.1mohm
Source & gate 3.75mohm
Gate & drain 0mohm


pu201 - BQ24780S_VDD
1-10.99v
2-10.99v
3-0v
4-0v
5-3.26v
6-2.79v
7-27milivolt
8-0
9-10milivolt
10-0
11-3.29v
12-3.29
13-0.79v
14-0.76v
15-0.302v
16-1.36v
17-10.99v
18-17.03v
19-10.99v
20-10.99
21-1.36v
22-0
23-0
24-5.99v
25-19milivolt
26-5.35v
27-5.37v
28-20v

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

Maybe laptop dont like this battery anymore, and enter in a "failure freeze" a protect mode?


Now that it's have too low volgae, laptop turn off after I connect the battery.

I cant start it, i do t remove battery then charger, then Conect again charger.

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

i see now that after laptop start - keyboard its not working, so must be related to battery connect

[Sephir0th]

Re: lenovo y530 dead ite replaced - problems

We're slowly moving into a direction which fits to the issue. Could be a issue with the Battery-to-system-FET

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

forget to atach schematics

[mon2]

Re: lenovo y530 dead ite replaced - problems

Remove pr206 = ~4k resistor. Do not lose this part.

Power up again with the power adapter.

Check the voltage to ground of the ACDRV pin on the charger IC.

Is the voltage now ~25v ?

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

Remove pr206 = ~4k resistor. Do not lose this part.

Power up again with the power adapter.

Check the voltage to ground of the ACDRV pin on the charger IC.

Is the voltage now ~25v ?

after removing pr206, laptop dont start.

pq201 dont receive voltage on gate pin.

[mon2]

Re: lenovo y530 dead ite replaced - problems

That is correct since we have removed the voltage for the gate pins of the DCin mosfets by removing this 4k resistor.

Can you measure the voltage to ground on the ACDRV pin on the charger IC?

We are only checking to see if the charger IC is able to BOOST the voltage to the proper levels by removing a possible leaky mosfet which will cause the ACDRV to be lower or even 0 volts.

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

That is correct since we have removed the voltage for the gate pins of the DCin mosfets by removing this 4k resistor.

Can you measure the voltage to ground on the ACDRV pin on the charger IC?

We are only checking to see if the charger IC is able to BOOST the voltage to the proper levels by removing a possible leaky mosfet which will cause the ACDRV to be lower or even 0 volts.

when i removed the resistor - i measured voltage on gate - pin 4 on pq201, and there was 0 volts

[mon2]

Re: lenovo y530 dead ite replaced - problems

Yes, that is expected.

Measure the voltage to ground of the other pin of the removed resistor pad.

[mcplslg123]

Re: lenovo y530 dead ite replaced - problems

PQ201/202-Gate & Drain resistance-0mohm. What do you mean by that? It doesnt make any sense. If your meter is showing o, then lower the scale to 200K and check again resistance between G-D

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

so 2 test

1 - without battery conecter
on pin 4 on pq201 i have 19.82V
pin 4 - 25.6v on pu201

test 2 - with battery conected - i charged on external charger
pin 4 - on pq201 -20.4v
pin 4 on pu 201 -20.3v

[mon2]

Re: lenovo y530 dead ite replaced - problems

Ok. Pin #4 is now the correct voltage to enable the DCin mosfets.

You have a fault with one of these DCin mosfets that is causing the ACDRV voltage to sink to 0 volts. The charger IC is behaving correctly.

As suggested above, remove all power and check the resistance of the DCin mosfets.

Often the 2nd mosfet gets killed and needs to be replaced. You can confirm the state with the resistance checks. If the readings are low, the mosfet is defective.

Source & drain
Source & gate
Gate & drain

Post each measurement. Use lots of flux and heat enough to melt the solder under the mosfet. Be patient and the mosfet will dance in the melted solder. Then remove to replace.

Once the resistance readings are ok, apply the removed 4k resistor onto the board again.

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

PQ201/202-Gate & Drain resistance-0mohm. What do you mean by that? It doesnt make any sense. If your meter is showing o, then lower the scale to 200K and check again resistance between G-D

I mean 1 megaohm. - on auto scale.

I test in resistor mode. No in diode mode

[mcplslg123]

Re: lenovo y530 dead ite replaced - problems

Its still not clear to me. This is what you posted at#24

pq201 first mosfet
Source & drain 3.7mohm
Source & gate 3.69mohm
Gate & drain 0 mohm

pq202 second mosfet
Source & drain 4.1mohm
Source & gate 3.75mohm
Gate & drain 0mohm

[darckreign1984]

Re: lenovo y530 dead ite replaced - problems

Its still not clear to me. This is what you posted at#24

pq201 first mosfet
Source & drain 3.7mohm
Source & gate 3.69mohm
Gate & drain 0 mohm

pq202 second mosfet
Source & drain 4.1mohm
Source & gate 3.75mohm
Gate & drain 0mohm

The multimeter have auto scale - and when I measure, I put the resistance mode and here was 0 mega ohm.
Open circuit.

[mon2]

Re: lenovo y530 dead ite replaced - problems

Post a picture of the meter face measuring this pair of pins.

If you leave the meter probes separated, do you see the same reading on the meter?

Ok, see the picture above.

Some corrections..

That is not 0M ohms. The face shows O.L. = over limit. That is, the resistance is so high that the meter is unable to measure it.

Take the measurement again and show the meter face. Is it the same??

If you short the probes, the measurement is different?

0M ohms statement is confusing, at least to me.